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Features include:Variable Sensitivity: The only portable refrigerant leak detector with 10 different sensitivity ranges for effectively locating all refrigerants, large or small. At the lowest sensitivity setting, the LS790a can detect an HFC-134a leak as small as 1/2oz. (15grams) per year. At the highest sensitivity setting, the unit can detect an HFC-134a leak as small as 1/4oz. (10grams) per year.

Clear: Clears the memory in the microcomputer and recalibrates to ambient.

Lock-Out™: Selects Lock-Out™ mode; measuring and recording the highest level detected by the Ion-Pump™. The alarm sounds a two-tone signal and the visual display flashes when the recorded high has been detected, "locking out" all background contamination.

Alarm Select: Selects audible alarm, visual indicator, or both.

Visual Indicator: 10 position moving LED display indicates varying halogen concentrations. As the concentration increases, the LED moves left to right. In the Lock-Out™ mode of operation, the LED’s flash only at the leak source. Low Battery Indicator: The low battery LED constantly illuminates at half brightness when batteries are low.

18" Flexible Probe: The metal cable probe easily twists and turns into otherwise inaccessible areas. You’re in and out in less time, with no coiled cord to tangle.

Power Saver: Automatically switches power off after 15 minutes of use. Extends battery life.

Super-Sensitive Ion Pump™: No moving parts, valves or fans. Provides an extremely precise flow of air through the sensor chamber. The only field replaceable Ion-pump sensor in the industry.